CN210484293U - Composite locking device and telescopic rod - Google Patents

Abstract

The utility model provides a composite locking device and a telescopic rod, relating to the technical field of telescopic rods, wherein the composite locking device comprises a connecting pipe fitting, a pressing type locking mechanism and a safety lock mechanism; the pressing type locking mechanism comprises a pressing handle and a positioning pin; a lock hole is arranged on the pipe wall of the connecting pipe fitting; the safety lock mechanism comprises a stop block, the stop block is configured to abut against the bottom of the other end of the pressing handle under a first working condition, and then the positioning pin is limited in the lock hole; and the other end far away from the pressing handle under the second working condition, so that the positioning pin is released; the latter includes an outer tube, an inner tube and the former. The utility model discloses alleviated and used push type locking mechanism to carry out the flexible member that locks among the prior art, at the during operation, push type locking mechanism is cut to pieces by the barrier easily and rubs to the state of pressing down and lead to the closure inefficacy, the technical problem that the influence was used.

Description

Composite locking device and telescopic rod

Technical Field

The utility model belongs to the technical field of flexible member technique and specifically relates to a compound locking device and telescopic link are related to.

Background

Among the prior art, in articles for daily use such as burnisher, house ornamentation instrument and garden instrument, often use flexible member for be connected with the functional head, in order to realize various functions.

In the existing telescopic rod piece, after the inner rod and the outer rod are stretched to a preset position, the locking is carried out through a locking mechanism; the locking mechanism comprises a push type locking mechanism and the like, when the telescopic rod piece is applied to the environment with more obstacles at the working points such as garden technology and the like, and when the locking mechanism between the inner rod and the outer rod is the push type locking mechanism, and the telescopic rod extends into the obstacles such as twigs and the like for operation, the push type locking mechanism is easily scratched by the obstacles to be rubbed to a pressed state to cause locking failure, and the use is influenced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a compound locking device and telescopic link to alleviate and use among the prior art flexible member that push type locking mechanism carries out the locking, at the during operation, push type locking mechanism is cut to scratch to the state of pressing down by the barrier easily and leads to the closure inefficacy, influences the technical problem who uses.

In a first aspect, an embodiment of the present invention provides a composite locking device, which is applied to a telescopic rod, and includes a connecting pipe, a pressing type locking mechanism, and a safety lock mechanism;

the pressing type locking mechanism comprises a pressing handle and a positioning pin; a lock hole is formed in the pipe wall of the connecting pipe fitting and penetrates through the pipe wall of the connecting pipe fitting; the positioning pin is connected to one end of the pressing handle; the pressing handle is hinged to the outer pipe wall of the connecting pipe fitting and configured to rotate relative to the connecting pipe fitting to drive the positioning pin to enter or leave the lock hole;

the safety lock mechanism comprises a stop block, and the stop block is configured to abut against the bottom of the other end of the pressing handle under a first working condition so as to limit the positioning pin in the lock hole; and the other end, which is far away from the pressing handle under the second working condition, further releases the positioning pin.

In an alternative embodiment, the stop comprises a seat and a pusher;

the base is connected to the outer pipe wall of the connecting pipe fitting in a manner of sliding along the length direction of the connecting pipe fitting; the pushing piece is fixed on the top of the base; the top surface of the pushing piece is an arc surface which is jacked up towards the top surface of the base; under the first working condition, one end of the base, which is close to the pressing handle, abuts against the bottom of the other end of the pressing handle.

In an alternative embodiment, the top of the pusher has a vertical distance from the central axis of the connecting tube that is greater than the maximum vertical distance between the other end of the pressing handle and the central axis of the connecting tube.

In an optional embodiment, an abutting groove is formed in one end, close to the pressing handle, of the base, and the abutting groove is used for clamping the other end of the pressing handle under the first working condition.

In an optional embodiment, the safety lock mechanism further comprises a sliding table connected to the outer pipe wall of the connecting pipe, and the stop block is slidably connected to the sliding table.

In an alternative embodiment, the composite locking device further includes a metal protector fixed to the connecting pipe, and the metal protector covers a portion of the connecting pipe, which is capable of contacting the positioning pin.

In an alternative embodiment, the composite locking device further comprises an outer locking member, the outer locking member is tubular, and one end of the outer locking member gradually reduces in diameter towards the other end of the outer locking member; the larger one end of diameter of outer retaining member cup joints in the outside of the one end of connecting the pipe fitting.

In a second aspect, an embodiment of the present invention provides a telescopic rod, including an outer rod, an inner rod, and the composite locking device of any one of the foregoing embodiments;

the outer rod is connected with one end of the connecting pipe fitting, the inner rod penetrates through the outer rod and the connecting pipe fitting in sequence, a plurality of fixing holes used for fixing the positioning pins are formed in the inner rod, and the fixing holes are formed in the inner rod and are arranged at intervals in the length direction of the inner rod.

In an alternative embodiment, a guide protrusion is provided on an inner wall of the connecting pipe, and the guide protrusion extends along a length direction of the connecting pipe; a guide groove is formed in the inner wall of the inner rod and extends along the length direction of the inner rod; the guide projection is fitted in the guide groove.

In an alternative embodiment, the outer contour of the end section of the inner rod is circular.

The embodiment of the utility model provides a compound locking device and telescopic link can realize following beneficial effect:

a first aspect of embodiments of the present invention provides a composite locking device, which is applied to a telescopic rod, the composite locking device including a connecting pipe, a press-type locking mechanism, and a safety lock mechanism;

the pressing type locking mechanism comprises a pressing handle and a positioning pin; a lock hole is formed in the pipe wall of the connecting pipe fitting and penetrates through the pipe wall of the connecting pipe fitting; the positioning pin is connected to one end of the pressing handle; the pressing handle is hinged on the outer pipe wall of the connecting pipe fitting and is configured to rotate relative to the connecting pipe fitting so as to drive the positioning pin to enter or leave the lock hole;

the safety lock mechanism comprises a stop block, the stop block is configured to abut against the bottom of the other end of the pressing handle under a first working condition, and then the positioning pin is limited in the lock hole; and the other end, which is far away from the pressing handle under the second working condition, further releases the positioning pin.

When the locking device is used, one end of the connecting pipe fitting can be connected with the outer rod of the telescopic rod, the inner rod of the telescopic rod sequentially penetrates through the outer rod and the connecting pipe fitting, the pressing handle is pulled up under a first working condition, the positioning pin enters the lock hole, the position of the stop dog in the safety lock mechanism is adjusted, the stop dog is stopped at one end of the pressing handle, the positioning pin is further prevented from being separated from the lock hole, the locking function of the positioning pin between the outer rod and the inner rod is guaranteed, the use is avoided, the pressing handle is scraped to the pressed state by a barrier to cause locking failure, and the use is influenced.

Under the second operating mode, when needing to remove the lock promptly, readjust the position of dog, make the dog keep away from and press the handle, the locating pin is released, and at this moment, the extension length of pole in order to adjust interior pole of relative slip inside and outside pole.

A second aspect of an embodiment of the present invention provides a telescopic rod comprising an outer rod, an inner rod and a composite locking device according to any one of the preceding embodiments; wherein, the outer pole is connected with the one end of being connected the pipe fitting, and interior pole passes the outer pole in proper order and is connected the pipe fitting, has seted up a plurality of fixed orificess that are used for the fixed locating pin on interior pole, and the length direction interval setting of inner pole is followed to a plurality of fixed orificess.

The utility model provides a telescopic link can reach all beneficial effects that above-mentioned compound locking device can reach.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is an isometric view of the overall structure of a composite locking device provided by an embodiment of the present invention without including an external locking member;

fig. 2 is an exploded schematic view of the overall structure of the composite locking device provided by the embodiment of the present invention without including the external locking member;

fig. 3 is a front view of the overall structure of a composite locking device provided by an embodiment of the present invention without including an external locking member;

FIG. 4 is a cross-sectional view A-A of FIG. 3;

FIG. 5 is a cross-sectional view B-B of FIG. 3;

fig. 6 is a schematic view of the overall structure of the telescopic rod provided with the composite locking device according to the embodiment of the present invention at a viewing angle;

FIG. 7 is a schematic view of a portion of the structure of FIG. 6;

fig. 8 is a schematic view of the overall structure of the telescopic rod provided with the composite locking device according to the embodiment of the present invention at another view angle;

fig. 9 is a partial structural cross-sectional view of fig. 8.

Icon: 01-outer pole; 02-inner rod; 0201-guide groove; 021-fixed wells; 1-connecting pipe fittings; 101-a guide projection; 11-a lock hole; 2-a push type locking mechanism; 21-pressing the handle; 22-a locating pin; 3-a safety lock mechanism; 31-a stopper; 311-a base; 3111-an abutment recess; 312-a pusher member; 32-a slide table; 4-a metal protection; 5-external locking piece.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the utility model is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element to be referred must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Some embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

Example one

This embodiment provides a compound locking device, and this compound locking device is applied to the telescopic link.

Specifically, referring to fig. 1 to 5 in combination with fig. 6 to 9, the composite locking device includes a connecting tube 1, a press type locking mechanism 2 and a safety lock mechanism 3;

the pressing type locking mechanism 2 comprises a pressing handle 21 and a positioning pin 22; a lock hole 11 is formed in the pipe wall of the connecting pipe fitting 1, and the lock hole 11 penetrates through the pipe wall of the connecting pipe fitting 1; the positioning pin 22 is connected to one end of the pressing handle 21; the pressing handle 21 is hinged on the outer pipe wall of the connecting pipe fitting 1 and configured to rotate relative to the connecting pipe fitting 1 to drive the positioning pin 22 to enter or leave the lock hole 11;

the safety lock mechanism 3 comprises a stop block 31, and the stop block 31 is configured to abut against the bottom of the other end of the pressing handle 21 under a first working condition so as to limit the positioning pin 22 in the lock hole 11; and the other end away from the pressing handle 21 in the second working condition, thereby releasing the positioning pin 22.

When the telescopic rod is used, one end of the connecting pipe fitting 1 can be connected with the outer rod 01 of the telescopic rod, the inner rod 02 of the telescopic rod sequentially penetrates through the outer rod 01 and the connecting pipe fitting 1, and under a first working condition, the pressing handle 21 is pulled up, so that the positioning pin 22 enters the lock hole 11; the position of the stopper 31 in the safety lock mechanism 3 is adjusted to be stopped at one end of the pressing handle 21, so that the positioning pin 22 is prevented from being separated from the lock hole 11, the locking function of the positioning pin 22 between the outer rod 01 and the inner rod 02 is ensured, and the situation that the pressing handle 21 is scratched by an obstacle to be pressed down in the using process to cause locking failure and influence on use is avoided.

Under the second working condition, namely when the locking needs to be released, the position of the stop block 31 is readjusted, so that the stop block 31 is far away from the pressing handle 21, the positioning pin 22 is released, and at the moment, the inner rod and the outer rod can relatively slide to adjust the extending length of the inner rod 02.

Further, referring to fig. 1 to 3, in an alternative embodiment of the present embodiment, the stopper 31 includes a base 311 and a pushing member 312; the base 311 is connected to the outer pipe wall of the connecting pipe 1 in a manner of being slidable in the longitudinal direction of the connecting pipe 1; the pusher 312 is fixed to the top of the base 311; and the top surface of the pushing member 312 is an arc surface which is jacked up towards the top surface of the base 311; in the first operating condition, one end of the base 311 close to the pressing handle 21 abuts against the bottom of the other end of the pressing handle 21.

In the optional embodiment, the base 311 is slid along the length direction of the connecting pipe fitting 1, so that the position of the stopper 31 is adjusted, and the optional embodiment has the beneficial effect of convenience in operation; the bottom of the sliding base 311 or the outer wall of the connecting pipe may be provided with anti-slip threads to fix the adjusted position of the stopper 31. In addition, in the optional embodiment, the top surface of the pushing member 312 is an arc surface that is jacked up towards the top surface of the base 311, so that the pushing member 312 can be guaranteed to have comfortable hand feeling when being pushed, and the pushing member 312 can easily slide over an obstacle when being blocked, so that the operation is smooth and convenient.

In the above-described alternative embodiment of the present embodiment, further alternatively, the vertical distance between the top of the pushing member 312 and the central axis of the connecting tube member 1 is larger than the maximum vertical distance between the other end of the pressing handle 21 and the central axis of the connecting tube member 1. That is, the top of the pushing member 312 is always higher than the pressing handle 21, so that the pushing member 312 can be prevented from being accidentally collided or hung on the pressing handle 21 to cause locking failure or being blocked in use during the reciprocating movement of the pushing member 312 in the working process, and the stability and effectiveness of the locking function can be further ensured.

In addition, in the above optional embodiment of the present embodiment, further optionally, an abutting groove 3111 is provided at one end of the base 311 close to the pressing handle 21, and the abutting groove 3111 is used for clamping the other end of the pressing handle 21 in the first operating condition. Thus, the pressing handle 21 can be effectively blocked by the abutting groove 3111, and the use reliability of the composite locking device is improved. In addition, as shown in fig. 1 to 3, in an optional embodiment of this embodiment, the above-mentioned safety lock mechanism 3 further includes a sliding table 32, the sliding table 32 is connected to the outer pipe wall of the connecting pipe 1, and the stopper 31 is slidably connected to the sliding table 32, wherein the sliding table 32 can be fixedly connected to the outer pipe wall of the connecting pipe 1 or can be integrally formed with the connecting pipe 1; the manner in which the stopper 31 is slidably connected to the slide table 32 is various, for example, a groove is provided on the upper surface of the slide table 32, a guide slide rail is provided on the inner side wall of the groove, guide sliders are provided on both sides of the stopper 31, and the guide sliders are made to slide along the guide slide rail, or a guide convex strip is provided on the upper surface of the slide table 32, a guide groove is provided on the bottom of the stopper 31, and the guide convex strip is made to be embedded in the guide groove and slide along the guide groove, and the like.

Of course, in another alternative embodiment of this embodiment, the stopper 31 may be an integral block structure, and a stop capable of stopping the pressing of the pressing handle 21 is disposed at one end of the stopper 31 close to the pressing handle 21 to realize the stopping function of the stopper 31; in addition, instead of the slide table 32, a slide protrusion may be provided at the bottom of the stopper 31, a groove may be provided in the connecting pipe 1, and the slide protrusion may be inserted into the groove and slide along the groove; or, the stopper 31 includes an annular body and a blocking portion connected to the annular body, the annular body is rotatably connected to the connecting pipe 1, under a first working condition, the annular body is rotated to make the blocking portion abut against the bottom of the other end of the pressing handle 21, and under a second working condition, the annular body is rotated to make the blocking portion far away from the other end of the pressing handle 21; alternatively, the stopper 31 may have another structure. However, in contrast, according to the structure of the above embodiment, the provision of the slide table 32 facilitates quick assembly of the stopper 31, and compared with the case where the groove is formed directly in the connecting pipe member 1, the connecting pipe member 1 of the structure of the embodiment has higher structural strength and longer service life. The contact area between the connecting pipe member 1 and the stopper 31 is larger, and the sliding process of the stopper 31 is more stable, so that the structure of the embodiment is preferably adopted to set the mounting structure of the stopper 31 in the connecting pipe member 1.

In addition, as shown in fig. 2, in an alternative embodiment of the present embodiment, the composite locking device further includes a metal protection member 4, the metal protection member 4 is fixed to the connecting pipe member 1, and the metal protection member 4 covers a portion of the connecting pipe member 1, which can contact with the positioning pin 22. Therefore, the metal protection piece 4 can protect the position of the connecting pipe fitting 1, which can be in contact with the positioning pin 22, so that the locking hole 11 is prevented from being abraded by the reciprocating movement of the positioning pin 22, or the positioning pin 22 extrudes the main body of the connecting pipe fitting 1 under the working pressure, and particularly under the condition that the main body of the connecting pipe fitting 1 is a plastic main body, the structure can improve the structural strength of the position, provided with the locking hole 11, of the connecting pipe fitting 1, and the service life of the composite locking device is prolonged. Wherein, the metal protection member 4 can be embedded or adhered to the connecting pipe member 1.

In addition, referring to fig. 6 to 9, in an alternative embodiment of the present embodiment, the composite locking device further includes an outer locking member 5, the outer locking member 5 has a tubular shape, and one end of the outer locking member 5 is gradually reduced in diameter toward the other end of the outer locking member 5; the end with the larger diameter of the outer locking piece 5 is sleeved outside one end of the connecting pipe fitting 1. In the use, when needs are adjusted the inside and outside pole, the outside locking piece 5 of unscrewing is adjusted the inside and outside pole, screw outside locking piece 5 after adjusting, at this moment, the less one end of diameter of outside locking piece 5 compresses tightly in interior pole 02 outsidely, can lock once more between the inside and outside pole on the basis of push type locking mechanism 2 and insurance latch mechanism 3, displacement change around the push type no longer appearing between the inside and outside pole after locking once more, in order to solve 2 locking backs of locking mechanism and to leap forward and backward, lead to connecting the work head on the telescopic link and locate the unsafe problem in operating position department, in order to further promote user's actual operation impression. Wherein, preferably, the end with larger diameter of the outer locking piece 5 is threaded and sleeved outside the end of the connecting pipe fitting 1.

Example two

The present embodiment provides a telescopic rod, as shown in fig. 6 to 9, which comprises an outer rod 01, an inner rod 02 and a composite locking device.

Wherein, referring to fig. 1 to 5 in particular, the composite locking device comprises a connecting pipe 1, a press type locking mechanism 2 and a safety lock mechanism 3; the pressing type locking mechanism 2 comprises a pressing handle 21 and a positioning pin 22; a lock hole 11 is formed in the pipe wall of the connecting pipe fitting 1, and the lock hole 11 penetrates through the pipe wall of the connecting pipe fitting 1; the positioning pin 22 is connected to one end of the pressing handle 21; the pressing handle 21 is hinged on the outer pipe wall of the connecting pipe fitting 1 and configured to rotate relative to the connecting pipe fitting 1 to drive the positioning pin 22 to enter or leave the lock hole 11; the safety lock mechanism 3 comprises a stop block 31, and the stop block 31 is configured to abut against the bottom of the other end of the pressing handle 21 under a first working condition so as to limit the positioning pin 22 in the lock hole 11; and the other end away from the pressing handle 21 in the second working condition, thereby releasing the positioning pin 22.

Further, referring to fig. 6 to 9, the outer rod 01 is connected to one end of the connecting pipe 1, the inner rod 02 sequentially penetrates through the outer rod 01 and the connecting pipe 1, a plurality of fixing holes 021 for fixing the positioning pins 22 are formed in the inner rod 02, and the plurality of fixing holes 021 are arranged at intervals along the length direction of the inner rod 02.

When the locking mechanism is used, under a first working condition, the pressing handle 21 is pulled up, the positioning pin 22 enters the lock hole 11, the position of the stop dog 31 in the safety lock mechanism 3 is adjusted to be stopped at one end of the pressing handle 21, and then the positioning pin 22 is prevented from being separated from the lock hole 11, so that the locking function of the positioning pin 22 between the outer rod 01 and the inner rod 02 is ensured, and the situation that the pressing handle 21 is scratched by an obstacle to a pressed state in the using process to cause locking failure and influence on use is avoided;

under the second working condition, namely when the locking needs to be released, the position of the sliding block 31 is readjusted, so that the block 31 is far away from the pressing handle 21, the positioning pin 22 is released, and at the moment, the inner rod and the outer rod can relatively slide to adjust the extension length of the inner rod 02.

In an alternative embodiment of the present embodiment, further, referring to fig. 6 to 9, and focusing on fig. 7 and 9, a guide protrusion 101 is provided on the inner wall of the connecting pipe member 1, the guide protrusion 101 extends along the length direction of the connecting pipe member 1; a guide groove 0201 is formed in the inner wall of the inner rod 02, and the guide groove 0201 extends in the length direction of the inner rod 02; the guide projection 101 is fitted in the guide groove 0201.

Through above structure, usable above-mentioned guide protrusion 101 and the mutual cooperation between the guide groove 0201, the smooth movement of pole 02 in connecting tube spare 1 and outer pole 01 just does not appear rotating in the control, is favorable to locating pin 22 to stabilize the lock catch in the fixed orifices 021 on interior pole 02.

In addition, in an optional implementation manner of this embodiment, referring to fig. 6 to 9, and with particular reference to fig. 6 and 7, the outer contour of the end section of the inner rod 02 is circular, so that compared with the outer contour of the end section of the inner rod 02 being in the shape of an oblong hole, the inner rod 02 of the telescopic rod provided in this embodiment has better adaptability when the functional head is assembled, and the contact area between the functional head and the inner rod is larger, which is beneficial to make the assembly between the telescopic rod and the functional head more compact and stable.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (10)

1. A composite locking device is applied to an expansion link and is characterized by comprising a connecting pipe fitting (1), a pressing type locking mechanism (2) and a safety lock mechanism (3);

the push type locking mechanism (2) comprises a push handle (21) and a positioning pin (22); a lock hole (11) is formed in the pipe wall of the connecting pipe fitting (1), and the lock hole (11) penetrates through the pipe wall of the connecting pipe fitting (1); the positioning pin (22) is connected to one end of the pressing handle (21); the pressing handle (21) is hinged to the outer pipe wall of the connecting pipe fitting (1) and configured to rotate relative to the connecting pipe fitting (1) to drive the positioning pin (22) to enter or leave the lock hole (11);

the safety lock mechanism (3) comprises a stop block (31), the stop block (31) is configured to abut against the bottom of the other end of the pressing handle (21) under a first working condition, and then the positioning pin (22) is limited in the lock hole (11); and the other end of the positioning pin is far away from the pressing handle (21) under the second working condition, so that the positioning pin (22) is released.

2. Composite locking device according to claim 1, characterized in that said stop (31) comprises a seat (311) and a pusher (312);

the base (311) is connected to the outer pipe wall of the connecting pipe fitting (1) in a manner of sliding along the length direction of the connecting pipe fitting (1); the pushing piece (312) is fixed on the top of the base (311); the top surface of the pushing piece (312) is an arc surface which is jacked up to the top surface of the base (311); under the first working condition, one end of the base (311) close to the pressing handle (21) abuts against the bottom of the other end of the pressing handle (21).

3. Composite locking device according to claim 2, characterized in that the vertical distance between the top of the pusher (312) and the central axis of the connecting tube (1) is greater than the maximum vertical distance between the other end of the pressing handle (21) and the central axis of the connecting tube (1).

4. Composite locking device according to claim 2, characterized in that an abutment recess (3111) is provided at one end of the base (311) close to the pressing handle (21), the abutment recess (3111) being adapted to clamp the other end of the pressing handle (21) in the first operating condition.

5. A composite locking device according to claim 1, wherein the safety lock mechanism (3) further comprises a slide (32), the slide (32) being connected to the outer tube wall of the connecting tube (1), the stop (31) being slidably connected to the slide (32).

6. Composite locking device according to claim 1, characterized in that it further comprises a metal protection (4), said metal protection (4) being fixed to said connecting pipe (1) and said metal protection (4) covering the portion of said connecting pipe (1) that can be in mutual contact with said positioning pin (22).

7. A composite locking device according to claim 1, further comprising an outer locking member (5), wherein the outer locking member (5) has a tubular shape, and one end of the outer locking member (5) is gradually reduced in diameter toward the other end of the outer locking member (5); the end with the larger diameter of the outer locking piece (5) is sleeved outside the end of the connecting pipe fitting (1).

8. A telescopic rod, characterized in that it comprises an outer rod (01), an inner rod (02) and a composite locking device according to any one of claims 1 to 7; wherein the content of the first and second substances,

outer pole (01) with the one end of being connected pipe fitting (1) is connected, interior pole (02) pass in proper order outer pole (01) with be connected pipe fitting (1) seted up a plurality ofly on interior pole (02) and be used for fixing fixed orifices (021) of locating pin (22), and a plurality of fixed orifices (021) are followed the length direction interval of interior pole (02) sets up.

9. The telescopic rod according to claim 8, characterized in that a guide projection (101) is provided on the inner wall of the connecting tube (1), the guide projection (101) extending in the length direction of the connecting tube (1); a guide groove (0201) is formed in the inner wall of the inner rod (02), and the guide groove (0201) extends along the length direction of the inner rod (02); the guide projection (101) is fitted in the guide groove (0201).

10. The telescopic rod according to claim 8, characterized in that the outer profile of the end section of the inner rod (02) is circular.

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